Add edge-watcher.sh (vps-0 oneshot: probes every backend the public site needs,
writes a per-form status oracle for SPA island-mode, emails UP→DOWN /
escalation / recovery / weekly-heartbeat with anti-flap), its systemd
oneshot+minute timer, and an idempotent deploy-edge-watcher.sh installer.
Document the verified 2026-06-21 topology + kill-switch/outbox design in
EDGE_ISLAND_MODE.md and update FORMS_AUDIT.md (forms now routed; no runtime
auto-disable yet).